WO2004106910A1 - Detecteur de gaz et son procede de production - Google Patents

Detecteur de gaz et son procede de production Download PDF

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Publication number
WO2004106910A1
WO2004106910A1 PCT/JP2004/007401 JP2004007401W WO2004106910A1 WO 2004106910 A1 WO2004106910 A1 WO 2004106910A1 JP 2004007401 W JP2004007401 W JP 2004007401W WO 2004106910 A1 WO2004106910 A1 WO 2004106910A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
rear end
peripheral surface
gas sensor
detection element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2004/007401
Other languages
English (en)
Japanese (ja)
Inventor
Hisaharu Nishio
Takashi Nakao
Kazuhiro Kouzaki
Yuuichi Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Priority to DE112004000050T priority Critical patent/DE112004000050B4/de
Publication of WO2004106910A1 publication Critical patent/WO2004106910A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4077—Means for protecting the electrolyte or the electrodes

Definitions

  • the present invention relates to a gas sensor (hereinafter, simply referred to as a sensor) such as an oxygen sensor used for detecting an oxygen concentration in exhaust gas of an internal combustion engine.
  • a gas sensor hereinafter, simply referred to as a sensor
  • an oxygen sensor used for detecting an oxygen concentration in exhaust gas of an internal combustion engine.
  • This kind of gas sensor has a detection element (hereinafter, simply referred to as an element) made of a cylindrical oxygen ion conductor whose front end is closed, having an electrode layer on the inner and outer surfaces, respectively. It is positioned and fixed within a surrounding metal fitting body. Then, the electrode layer on the outer peripheral surface is electrically connected to the metal fitting main body, and a terminal member (metal terminal) is inserted into the opening at the rear end of the detecting element from the internal connection terminal side on the distal end side to insert the inner peripheral surface. (See, for example, FIGS. 2 and 3 in Patent Document 1).
  • This element is attached to the exhaust pipe of an internal combustion engine from the outside.
  • the electrode layer (reference electrode layer) on the inner peripheral surface (inner surface) of the element is used as a reference oxygen gas (atmosphere), and the outer peripheral surface (outer surface).
  • the electrode layer (measurement electrode layer) is brought into contact with the exhaust gas to generate an electromotive force (potential difference) between the two electrodes corresponding to the oxygen concentration difference on the inner and outer peripheral surfaces of the element, and controls the signal based on this electromotive force. It outputs to the circuit, detects the oxygen concentration, and controls the air-fuel ratio.
  • a ceramic sleeve is arranged at the rear end of the sealing material, and at a portion near the rear end of the bracket body, for example, a sleeve pressing and fixing is performed by bending the portion near the rear end inward and pressing the sleeve toward the front end side.
  • the seal material was compressed by means to secure the seal.
  • Patent Document 1 Japanese Utility Model Application Publication No. Sho 53-958584 (FIGS. 2 and 3) ⁇ Disclosure of the Invention>
  • the sealing material straddles the two components of the element and the terminal member in the axial direction.
  • the arrangement area becomes longer.
  • the sealing performance as a sensor may be deteriorated without obtaining sufficient sealing performance.
  • it is conceivable to increase the packing density of the sealing material having a long axial length by applying a high load but this is not practical because the load may crack the detecting element.
  • an output connection cord is connected to the terminal member (metal terminal) to output to the control device.
  • the outside of the terminal fitting of the cord is usually covered with a rubber cap (rubber cover).
  • the rubber cap since the temperature of the metal fitting body that forms the sensor becomes high due to the heat of the exhaust gas, the rubber cap also becomes a high-Pen due to the propagation of this heat and the radiant heat. Therefore, even if a rubber material having high heat resistance is used for the rubber cap, it is necessary to take measures to protect against such heat damage. Because of this, rubber When the cap is fitted (set) to the gas sensor, it is necessary to keep a predetermined distance (distance) from the rear end of the bracket body to the tip of the rubber cap.
  • the invention according to claim 1 is a metal fitting formed so as to surround a detection element having a cylindrical shape with a closed end and having an electrode layer on the inner and outer peripheral surfaces. Positioned inside the body, electrically connecting the electrode layer on the outer peripheral surface to the metal fitting body,
  • a gas sensor comprising a terminal member inserted into a rear end opening of the detection element from a front end side thereof and electrically connected to an extreme layer of the inner peripheral surface
  • a cylindrical ceramic sleeve provided with a convex portion on the outer peripheral surface has a sleep rear end positioned behind the rear ends of the metal fitting body and the detection element, and the sleeve front end positions the seal material on the front end side.
  • the seal material is compressed by the sleeve pressing and fixing means for fixing the sleeve in a state where the sleeve is pressed to the front end side via the convex portion of the ceramic sleeve.
  • the sealing material is disposed only on the front end side from the rear ends of the fitting body and the detection element.
  • the ceramic sleeve is coaxially arranged with respect to the detection element, and the end of the sleep thereof is positioned more distal than the rear end of the detection element, and the sealing material is compressed toward the distal end. It is characterized by the following.
  • front end refers to the lower end or lower side of the gas sensor or constituent member in FIG. 1; Refers to the top or top of the component.
  • the sealing material is attached to the outer peripheral surface of the part near the rear end of the element and the outer peripheral surface of the terminal member located behind the element.
  • the amount of the sealing material tends to increase, and the length of the sealing material in the axial direction increases, and as a result, it is difficult to increase the packing density of the sealing material. I got it.
  • the sealing material is disposed only in the annular space between the inner peripheral surface of the metal fitting body (hereinafter, also simply referred to as the main body) and the outer peripheral surface of the element, and is compressed by the sleeve. It has a structure.
  • the ceramic sleeve is arranged coaxially with the detection element and the rear end side of the detection element is arranged inside the front end of the ceramic sleeve. That is, the compression is performed.
  • the length of the sealing material in the axial direction can be made shorter than that of the conventional sensor structure, and the sealing material under the state of receiving the pressing force from the ceramic sleeve has a high density and a high specific gravity. It can be. As a result, it is possible to obtain a gas sensor having better sealing performance than the conventional one.
  • the sleeve for compressing the sealing material is pressed to the front end side.
  • the pressing and fixing means can be provided on the distal end side of the conventional sensor.
  • the axial length is not particularly limited as long as the sealing performance between the inner peripheral surface of the detection element and the outer peripheral surface of the bracket body can be sufficiently obtained. Performance can be obtained.
  • the “length of the seal material in the axial direction” means the length between the end on the front end side and the end on the rear end side of the seal material that comes into contact with the detection element. And the length in the direction parallel to the axial direction of the detection element.
  • the form of the convex portion provided on the outer peripheral surface of the sleeve may be discontinuous in the circumferential direction when viewed from the axial direction, for example, in the form of an external gear. It is preferable that the flange is annular. This is because the sleeve itself can be satisfactorily pressed toward the distal end in the axial direction by using the convex portion formed of the annular flange.
  • the convex portion may be provided on the outer peripheral surface of the sleeve.
  • the convex portion has a tip of the ceramic sleep. Or it is good to be provided in the part near the tip.
  • the third aspect of the present invention is the gas sensor according to the first or second aspect, wherein the ceramic sleeve surrounds an outer peripheral surface of the terminal member. In this way, by surrounding the outer peripheral surface of the terminal member, in addition to protection of the inside of the sensor, the mounting of the terminal member is stabilized. In addition, a rubber cap that covers the terminal fitting of the connection cord connected to the terminal member is located near the rear end of the sensor.
  • the sleeve pressing and fixing means As the sleeve pressing and fixing means, as described in claim 5, the sleeve pressing and fixing means is formed by caulking the periphery of a portion near the rear end of the metal fitting body to the rear of the convex portion of the sleeve. It is preferable to use a cover.
  • the present invention is not limited to this as long as the sleeve is pressed and fixed to the distal end side via the convex portion of the ceramic sleeve.
  • the annular member is connected to the rear end of the fitting body. It may be fixed to the close part by welding or the like. That is, appropriate means can be used.
  • a preferred method for producing the gas sensor of the present invention is as described in claims 6 to 8.
  • the ceramic sleeve in manufacturing the gas sensor according to the fifth aspect, is arranged such that a rear end of the sleeve is located rearward of a rear end of the metal fitting body and the rear end of the detection element, and a sleep front end thereof.
  • the ceramic sleeve After arranging the see-through material to be compressible on the front end side, the ceramic sleeve is pressed to the front end side, and the seal material is compressed to the front end side by the sleep front end, and the sleeve is compressed in the sleeve.
  • a method of manufacturing a gas sensor characterized in that a peripheral edge of a portion near a rear end of the metal fitting body is swaged inward to cover a rear portion of the convex portion.
  • the rear end of the sleeve made of the ceramic is positioned behind the rear end of the metal fitting body and the detection element, and the sleeve end is formed by the front end of the sleeve.
  • a method for manufacturing a gas sensor wherein a peripheral edge of a portion near a rear end of the metal fitting body is swaged inward on a rear portion of the convex portion in the above.
  • the axial length of the sealing member can be shorter than that of the conventional sensor structure. For this reason, the sealing material under the pressing force from the ceramic sleeve can be made to have a high density and a high specific gravity. be able to.
  • the detection element is arranged inside the front end of the ceramic sleeve at the rear end side, a slip for compressing the sealing material is pressed to the front end side.
  • the sleeve pressing and fixing means at the portion near the rear end can be provided on the front end side of the conventional sensor.
  • the ceramic sleeve is pressed to the tip side and the sealing material is compressed to the tip side by the sleeve tip, or the sealing material is pressed to the tip side.
  • the peripheral edge of the metal part body near the rear end is swaged inward to cover the metal part. For this reason, at the time of caulking, the sealing material is compressed, so that a high sealing property is ensured.
  • the end of the sleeve of the ceramic sleeve may be brought into contact with the sealing material so that the ceramic sleep is pressed toward the end, or the sleeve of the ceramic sleeve may be pressed.
  • An intermediate member for example, an annular plate member having a constant thickness
  • FIG. 1 is a half sectional front view showing an embodiment of a gas sensor of the present invention.
  • Fig. 2 is an enlarged view of part A (main part) of Fig. 1.
  • FIG. 3 is a cross-sectional front view showing the in-process product of the gas sensor of FIG. 1 (before assembling the terminal member).
  • Fig. 4 is a half cross-sectional front view of the state in which the gas sensor of Fig. 1 is attached to the exhaust pipe, and the terminal fitting of the cord with a rubber cap is connected to the terminal member.
  • FIG. 5 is an enlarged sectional view of a main part showing another example of the sleeve pressing and fixing means in the gas sensor of the present invention.
  • FIG. 6 is an enlarged sectional view of a main part showing another example of the sleeve pressing and fixing means in the gas sensor of the present invention.
  • FIG. 7 is an enlarged cross-sectional view of a main part showing another example of a projection on a ceramic sleeve.
  • FIG. 8 is an enlarged cross-sectional view of a main part showing another example of a projection on a ceramic sleeve.
  • FIG. 9 is an enlarged cross-sectional view of a main part in FIG. 2, in which an annular plate member is interposed between a tip end of a ceramic sleeve and a sealing material.
  • reference numeral 1 denotes the gas sensor (oxygen sensor) of the present example
  • bracket main body 2 is made of SUS430, and a small diameter is formed in a straight section with a thin circular cross section at the tip side (the lower side in the figure).
  • an inner peripheral step 4 having an upwardly tapering shape, and is located rearward from the rear end (upper end in the figure) of the inner peripheral step 4.
  • the inner peripheral surface behind the rear end of the cylindrical inner peripheral surface 5 is expanded upward from the cylindrical inner peripheral surface 5 via a tapered surface 6 having an enlarged diameter, and is formed into a large-diameter cylinder including a thin-walled cylindrical portion 7. It has a peripheral surface 8.
  • the rear end portion 7 b of the thin-walled cylindrical portion 7 is pressed from the cylindrical state coaxial with the sensor axis G by the force P to the tip side by the force P, and is bent inward. At the same time, it was caulked to the tip.
  • the inner peripheral surface of the metal fitting body 2 has an inner peripheral surface that is the same as the axis of the sensor (the same as the axis of the screw 10 described below). It has a stepped cylindrical shape that expands coaxially.
  • a hexagonal portion 9 for mounting (screw-in) to the exhaust pipe H is provided in an expanded shape outside the portion corresponding to the cylindrical inner peripheral surface 5 and the tapered surface 6 in the metal fitting body 2.
  • a screw 10 for mounting is provided on the outer periphery of the lower part of the hexagonal portion 9, and a reduced diameter portion 11 whose outer diameter is reduced is provided on a tip side of the mounting screw 10,
  • a plurality of element protection caps 12 having gas circulation holes are fitted and fixed by welding or the like.
  • the thin cylindrical portion 7 described above is connected to the upper portion of the hexagonal portion 9.
  • a ring-shaped metal member is provided on the inner peripheral step 4 inside the bracket body 2 from the rear end side.
  • Packing 13 is set in a mounted state.
  • a detection element 15 having a closed end 15a and a cylindrical shape is inserted from above into the metal fitting body 2 coaxially from the front end 15a side.
  • the detecting element 15 is provided with an outer peripheral convex portion (flange) 16 provided so as to protrude outward on the outer peripheral surface slightly above the intermediate position, and the outer peripheral convex portion (flange) 16 is provided.
  • it is positioned in a dead end shape on the inner peripheral step portion 4 inside the metal fitting body 2 via the metal packing 13.
  • the electrode layer (not shown) is formed on the outer peripheral surface on the distal end side of the element 15.
  • the electrode layer extends to the outer peripheral convex portion 16, and the metal fitting 13 is provided via a metal packing 13. It is electrically connected to the main unit 2.
  • the outer peripheral convex portion 16 is formed such that the side on the tip end side corresponds to the taper angle of the inner peripheral step portion 4, and the outer diameter is set so as to fit within the cylindrical inner peripheral surface 5. ing.
  • the width in the vertical direction (axis G) of the outer peripheral convex portion 16 is set to be smaller than the dimension in the vertical direction of the cylindrical inner peripheral surface 5.
  • the outer peripheral surface on the front end side is formed into a tapered shape with a gentle taper, and the outer peripheral surface on the rear end side is formed in a substantially straight shape.
  • the inner and outer peripheral surfaces near the opening at the rear end 15b are chamfered.
  • a metal (N i) wire Packing of 18 is arranged above the outer peripheral convex portion 16 of the element 15 and between the outer peripheral surface 15 c of the element 15 and the cylindrical inner peripheral surface 5 of the main body 2. Then, in the annular space formed by the inside of the enlarged-diameter cylindrical inner peripheral surface 8 which is the inner peripheral surface of the tapered surface 6 of the metal fitting body 2 and the thin cylindrical portion 7 and the outer peripheral surface 15 c of the element 15.
  • a sealing material 21 made of talc powder (or hexagonal boron nitride powder) is arranged (compressed and filled) in this embodiment.
  • the sealing member 21 is arranged such that the rear end thereof is located closer to the front end side than the rear ends of the element 15 and the main body 2, and has a substantially wedge-shaped cross section in the present embodiment.
  • a ceramic sleeve 25 made of alumina or the like and formed in a substantially cylindrical shape and having an insulating property is arranged and fixed as follows. That is, the ceramic sleeve 25 has its tip 26 closer to the rear end 15 b of the element 15, the outer peripheral surface 15 c closer to the b, and the main body 2 thin inner cylindrical portion 7 inner peripheral surface 8. Between them, they are arranged coaxially with the element 15. And the tip 2 At 6, the sealing material 21 is compressed to the tip side, and the seal between the metal fitting body 2 and the element 15 is maintained.
  • the sleeve 25 is provided with a convex flange 28 on the outer peripheral surface of the distal end 26 in the circumferential direction, and is fixed with the sleeve 25 pressed to the distal end side via the flange 28.
  • the seal material 21 is compressed by the sleep pressing and fixing means to hold the seal between the metal fitting body 2 and the detection element 15.
  • an O-ring packing 30 made of metal (SUS430) wire is arranged on the rear portion (the surface facing the rear end) 28 b of the flange 28, and in that state, as described above, The sleeve is pressed to the front end side by crimping and covering the periphery of the rear end portion 7b of the cylindrical portion 7 inside.
  • the in-process product shown on the left side of Fig. 3 is presented.
  • a predetermined load for example, as indicated by an arrow K in FIG. 3
  • the ceramic sleeve 25 it is preferable to press the ceramic sleeve 25 to the distal end side at 10 to 30 kN) to compress the sealing material 21 to the distal end side by the sleep distal end 26.
  • the die D is pushed toward the front end, and the periphery of the part 7 b near the rear end of the metal fitting body 2 is added to the rear of the convex part 28 of the sleep 25. It is preferable to tighten and cover.
  • the sealing material 21 can be sufficiently compressed separately from the force-shrinkage, so that a higher sealing property is ensured.
  • the peripheral edge of the part 7 b near the rear end of the bracket body 2 should be swaged inward to cover the rear part of the convex part 28 in the sleep 25. It may be.
  • such a ceramic sleeve 25 of the present embodiment has a flange 29 slightly projecting inward on the inner peripheral surface on the rear end 27 side, and inside this terminal member 3 1 for output. Is formed to be interpolated.
  • the inner and outer peripheral surfaces of the sleep 25 have the same diameter (straight) except for the flanges 28 and 29, and in this embodiment, at least half of the rear end portion is the element 15 and the element 15. It protrudes rearward from the rear end of the bracket body 2 and is exposed to the outside.
  • the ceramic sleeve 25 also functions as a protective cylinder for mechanically protecting the element 15 from the outside.
  • the terminal member 31 formed into a tapered stepped cylindrical shape is attached to the in-process sensor shown in Fig. 3 by the ceramic sleeve 25 from the side of the internal connection terminal 33 on the tip side.
  • the sensor shown in Figs. 1 and 4 is assembled by pressing the element 15 into the opening near the rear end 15b of the element 15 through the inside.
  • the internal connection terminal 33 of the terminal member 31 is pressed into contact with an electrode layer (not shown) formed on the inner peripheral surface 15 d of the element 15 by its own panel property, and is electrically connected (conductive). ) Is held. As shown in FIG.
  • the axial length L 1 from the rear end 2 b of the main body 2 to the rear end 3 1 b of the terminal member 3 1 in the sensor 1 assembled in this manner is equal to the connection cord 40.
  • the rubber cap 45 covering the terminal fittings 43 of the connecting cords 40 causes heat damage to the exhaust pipe.
  • the length is set so that the necessary axial length S is held between the rear end 2 b of the main body 2 and the rubber cap 45 of the connection cord 40 so as not to be received.
  • the terminal member 31 is inserted in advance into the opening of the rear end 15 b of the detection element 15 and electrically connected to the electrode layer on the inner peripheral surface thereof. 5 can be set, and the peripheral edge of the portion 7b near the rear end of the metal fitting body 2 can be swaged inward to cover.
  • the terminal member 31 is inserted into the sleeve 25 from the front end side.
  • the ceramic sleep 25 when the ceramic sleep 25 is set after the terminal member 31 is inserted into the detection element 15 in advance, the ceramic sleep 25 is set due to the inclination of the terminal member 31. It may interfere with the terminal member 31 or collide, making it difficult to set. However, when the terminal member 31 is inserted later, such a problem can be easily avoided.
  • the terminal member 31 has a small-diameter insertion guide portion 32, a portion of the internal connection terminal 33, an intermediate cylindrical portion 34, and a portion extending from the front end 31a to the rear end 31b.
  • It is formed by rolling a metal sheet made of SUS304 so as to form an external connection terminal 36 near the rear end via the constricted portion 35, and one side is cut along the axis. (See the figure on the right in Figure 3).
  • the cut in the internal connection terminal 33 is formed unevenly in the axial direction, and when the device is set on the element 15, the internal connection terminal 33 has a portion formed on the inner peripheral surface 15 of the element 15 due to the panel characteristics. It is formed so as to be pressed against the electrode layer d.
  • the rear end of the outer peripheral surface forming the external connection terminal 36 is formed in a chamfered shape, and is formed so as to be easily covered with the terminal fitting 43 constituting the connection cord 40.
  • the connection cord 40 includes a terminal fitting 43, a rubber cap 45 covering the terminal fitting 43 (for example, formed of fluorine-based rubber), a lead wire 41, and a terminal fitting 43 at one end. And a crimping terminal 42 that is electrically connected to the other end while being crimped to the lead wire 41.
  • the terminal fittings 4 3 have rigidity to reduce the diameter of the external connection terminal 36 of the terminal member 31 without being deformed when the terminal fittings 4 3 are fitted and connected to the outside of the terminal member 31.
  • connection cord 40 By attaching such a connection cord 40 to the gas sensor 1, an output signal from the detection element 15 of the gas sensor 1 can be transmitted to an external device (for example, an ECU) through the lead wire 41.
  • an external device for example, an ECU
  • connection cord 40 shown in FIG. 4 includes a rubber cap 45 having an L-shaped cross section as shown in FIG. 4 so as to cover the terminal fitting 43 when it is attached to the sensor 1.
  • the inside of the rubber cap 45 near the opening is formed so as to be elastically fitted to the sleeve 25.
  • Reference numeral 38 in the terminal member 31 is a stopper for preventing excessive insertion of the element 15, and is formed so as to protrude outward so as to be locked to the rear end 27 of the sleep 25.
  • 3 9 in the figure denotes a retaining after insertion of the terminal member, at the time ⁇ narrowed down by the spring resistance at an inner circumferential surface of the flange 2 9 of the rear end 2 7 ceramic Sleep 2 5
  • the flange 29 is opened at the tip of the flange 29 by a panel, and is formed in a tongue-like shape extending upward and in a notch shape in the intermediate cylindrical portion 34.
  • such a sensor 1 is attached to the exhaust pipe H via a washer W by a screwing method. Then, to the external connection terminal 36 of the terminal member 31, By covering the terminal fittings 43 of the connection cord 40, conduction between them is maintained and used as a sensor.
  • the ceramic sleeve 25 is assembled coaxially so that the portion near the front end of the ceramic sleeve 25 overlaps the outer peripheral surface 15 c near the rear end 15 b near the element 15. ing. That is, the sealing material 21 exists only around the outer peripheral surface of the element 15 inside the main body 2 and is not disposed so as to straddle the element and the terminal member in the axial direction as in the related art.
  • the length L 3 in the axial direction of the sealing material 21 can be reduced. Therefore, the packing density of the sealing material 21 in a state of being compressed and filled by the pressing force of the sleeve 25 can be increased, and the gas sensor 1 having excellent sealing performance as compared with the conventional sensor structure can be obtained. be able to.
  • the length L3 of the sealing material is 4 mm.
  • the position where the flange 28 of the sleeve 25 is formed is set on the outer peripheral surface of the distal end 26 while reducing the axial arrangement area of the sealing material 21, so that the position of the rear end 2 b of the main body 2 is Since it can be set at the tip side of 5, the sensor can be made shorter and, consequently, more compact.
  • the length L2 from the exhaust pipe to the rear end of the sensor when the sensor 1 is mounted on the exhaust pipe H can be reduced, so that the mounting space can be reduced.
  • the rubber cap 45 of the connection cord 40 is elastically fitted (contacted) to the outer peripheral surface of the ceramic sleep 25 while maintaining the axial length S. . For this reason, heat damage to the rubber cap 45 can be reduced, the mounting of the cap can be stabilized, and the effect of preventing water and oil from entering the inside of the sensor can be kept high.
  • FIG. 5 shows another example of the slip pressing and fixing means. Only the differences from the above-described embodiment will be described, and the same portions will be denoted by the same reference numerals. The same applies to the following.
  • a ring 51 having an L-shaped cross section as shown in the figure is externally fitted to the outer peripheral surface of the portion 7 b near the rear end of the main body 2 through the vertical cylindrical portion 52, and the flat ring portion 53.
  • O-ring packing It is arranged so that 30 is pressed. Then, the sleep is pressed to the distal end side as shown by the arrow P through the ring 51 to compress the sealing material 21, and under this state, the inner peripheral surface of the vertical cylindrical portion 52 and the main body 2 are compressed.
  • the sleeve 25 is fixed to the main body 2 by welding between the rear end portion 7b and the outer peripheral surface of the portion 7b.
  • a screw 7 c is provided on an outer peripheral surface of a portion 7 b near the rear end of the main body 2, and a vertical cylindrical portion 6 2 of a ring 61 having an L-shaped cross section as shown in the figure is provided.
  • a female screw is provided on the inner peripheral surface of the main body 2, and this is screwed into the screw 7 c of the main body 2, so that the O-ring packing 30 is inserted through the flat ring portion 63 protruding inside the upper end of the vertical cylindrical portion 62.
  • the sleep 25 may be compressed to the distal end side.
  • the convex portion of the ceramic sleeve 25 is an annular flange, but is not limited to this.
  • the protruding portion of the ceramic sleeve 25 is provided at the front end, but this position is, as shown in FIG. 7, for example, a position closer to the rear end than the front end 26 of the sleeve 25. It may be as.
  • the sealing material is arranged so as to compress the sealing material 21 even at the tip end surface 28 a of the projection 28.
  • the sealing material 21 is also compressed at the distal end surface 28 a of the flange (convex portion) 28, but such a convex portion is not responsible for the compression of the sealing material. Is also good.
  • FIG. 8 shows an example of this, in which the inner diameter of the tapered surface 6 near the tapered surface 6 of the inner peripheral surface 8 in the above-described embodiment is reduced, and the outer diameter of the sealing material 21 is reduced.
  • the sealing material 21 is compressed only at the tip 26 of the sleeve except for the flange (convex portion) 28 near the tip of the sleeve 25.
  • the position of the protrusion 28 in the direction of the axis G may be any position from the viewpoint of reducing the amount of sealing material used.
  • the rear end of the main unit is located more rearward as the position is closer to the rear end. The same applies to the case where the thickness of the projection 28 in the direction of the axis G is large.
  • the element 15 may be damaged due to excessive stress applied thereto and the element 15 being cracked. In order to prevent such damage, it is necessary to provide a certain gap between the outer peripheral surface of the element 15 and the inner peripheral surface of the sleeve 25. On the other hand, as such a gap becomes larger, there is a possibility that problems such as protrusion or leakage of the sealing material 21 from the gap may be caused. However, as shown in FIG.
  • the ceramic sleeve is configured to protrude from the rear end of the terminal member near the rear end thereof and surround the outer peripheral surface of the terminal member.
  • the present invention is not limited to this.
  • the length of the sleeve may be set appropriately, and the terminal member may be connected to the terminal of the cord for connection thereto.
  • the terminal member is not necessarily made of the ceramic sleeve. It does not need to protrude from the rear end.
  • the ceramic sleeve is embodied as having the same diameter (straight) except for the protruding portion on the outer peripheral surface, but may be tapered.
  • the tapered end is formed with a gentle taper toward the rear end (upper end in the figure)
  • the rubber cap of the terminal fitting of the cord is tapered to ensure stable fixation. .
  • the metal sheet is rolled into a cylindrical shape with ends in the circumferential direction.
  • it may be formed of a tubular material that is endless in the circumferential direction.
  • the ceramic sleeve in the present invention is not limited to alumina as long as it has insulating properties.
  • the sealing material is not limited to talc or hexagonal boron nitride powder.

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  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

Selon la présente invention, le nombre de fois qu'est utilisé un élément de joint de maintien de l'étanchéité à l'air entre un élément et un corps d'élément métallique d'un détecteur est diminué, la capacité de fermeture étanche est améliorée et le détecteur est conçu pour présenter une forme plus courte et plus petite. Dans un détecteur de gaz, un élément de détection (15) est positionné dans un corps d'élément métallique (2), une couche d'électrode sur une surface périphérique externe est connectée électriquement et un élément de terminal (31) est introduit dans ledit élément (15) de manière à être connecté électriquement à une couche d'électrode sur une surface périphérique interne. En vue de retenir un élément de joint (21) situé entre le corps d'élément métallique (2) et l'élément de détection (15) par le biais de sa compression en direction du côté de la tête au moyen d'un manchon en céramique (25) pourvu d'une bride (28), ledit élément de joint (21) est placé plus du côté de la tête que des extrémités arrière (2b, 15c) du corps de l'élément métallique et de l'élément de détection. En outre, une tête de manchon (26) est positionnée plus du côté de la tête que d'une extrémité arrière (15c) de l'élément de détection et elle comprime l'élément de joint (21). Ledit élément de joint (21) n'enjambe pas l'élément de terminal dans la direction de l'axe (G) contrairement aux produits traditionnels, ce qui permet de diminuer l'importance de l'élément de joint.
PCT/JP2004/007401 2003-05-29 2004-05-24 Detecteur de gaz et son procede de production Ceased WO2004106910A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112004000050T DE112004000050B4 (de) 2003-05-29 2004-05-24 Gassensor und Verfahren zur Herstellung desselben

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003-151795 2003-05-29
JP2003151795 2003-05-29

Publications (1)

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WO2004106910A1 true WO2004106910A1 (fr) 2004-12-09

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PCT/JP2004/007401 Ceased WO2004106910A1 (fr) 2003-05-29 2004-05-24 Detecteur de gaz et son procede de production

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CN (1) CN100516859C (fr)
DE (1) DE112004000050B4 (fr)
WO (1) WO2004106910A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023158A1 (de) * 2007-05-16 2008-11-20 Robert Bosch Gmbh Gassensor
JP5170903B2 (ja) * 2009-07-03 2013-03-27 日本特殊陶業株式会社 センサユニット
US8764955B2 (en) 2010-07-22 2014-07-01 Ngk Spark Plug Co., Ltd. Gas sensor
JP5149945B2 (ja) 2010-09-03 2013-02-20 日本特殊陶業株式会社 ガスセンサ及びその製造方法

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JPS5395884U (fr) * 1976-12-30 1978-08-04
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JP2002202279A (ja) * 2000-10-31 2002-07-19 Ngk Spark Plug Co Ltd ガスセンサの製造方法
JP2002286684A (ja) * 2001-03-28 2002-10-03 Denso Corp ガスセンサの製造方法

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JPH0754313B2 (ja) * 1984-09-14 1995-06-07 株式会社日立製作所 酸素濃度検出器
US6415647B1 (en) * 1998-10-30 2002-07-09 Denso Corporation Compact structure of gas sensor and production method thereof
DE10302153A1 (de) * 2002-01-21 2003-09-04 Ngk Spark Plug Co Gassensor
US7241370B2 (en) * 2002-08-20 2007-07-10 Ngk Spark Plug Co., Ltd. Protective covers for gas sensor, gas sensor and gas sensor manufacturing method

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JPS5395884U (fr) * 1976-12-30 1978-08-04
JPH1010082A (ja) * 1996-06-26 1998-01-16 Ngk Spark Plug Co Ltd ガスセンサ
JP2002202279A (ja) * 2000-10-31 2002-07-19 Ngk Spark Plug Co Ltd ガスセンサの製造方法
JP2002286684A (ja) * 2001-03-28 2002-10-03 Denso Corp ガスセンサの製造方法

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DE112004000050B4 (de) 2011-06-16
CN1701230A (zh) 2005-11-23
DE112004000050T5 (de) 2005-08-04
CN100516859C (zh) 2009-07-22

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